Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 User Manual, Firmware rev. 3.0 or LATER - Manual (Page 286)

286 Publication 1404-UM001F-EN-P - November 2009
Appendix C Sample Applications
The source and destination data tables in the PLC-5 must contain at
least as many words as the block transfer length.
The Read Clock from PM3K and Set Clock from PLC bits are used to
initiate the messages, and are reset when the message instruction
either completes successfully or an error occurs. In your application
code, if the message rungs are controlled programmatically, ensure
that only one message is enabled at a time, and add sufficient time
delays between block transfers to avoid overloading the channel.
Ladder Diagram